An evacuation order may come or a disaster may strike when you're at work, on vacation, or otherwise out of the house.
Make arrangements well in advance for a trusted neighbour to take your animals and meet you at a specified location. Be sure the person is comfortable with your companion animals, knows where they are likely to be, knows where your disaster supplies are kept, and has a key to your house. Give them written permission to ask a vet to give emergency treatment if needed.
If you use an animal-sitting service, it may be able to help, but discuss that possibility well in advance.